Asbignob to leeds



June 5, 1923. V v Re.'15,61 7

H. BREWER i w umsunme AND mmcnma APPARATUS Original Filqd Feb. 21 1919 1 t 1 June 5,1923. Re. 15,617

v H. BREWER umsunmc- AND mmqxrmd harm's Original Filed Feb. 21; 19-19 3 Sheets-Sheet 2 Q h v INVENTOR 74-4 W 7 I may;

- 4 ATTORNEY V June 5, 1923. v Re 1 5,617

H. BREWER mmsuame AND mum/mus APPARATUS Original Filed Feb. 21 l919 v 3 Sheets-Sheet 3 &

jwmon it 151 momvn Reiuued June s, 1923. j

" um'r-so] sra'rssf "PATENT orrics.

ma! aazwn, or wlmn'r'ra, rumors, mission To mans snowman? collrmsnvam, A CORPORATION 01 PENNSYLVANIA.

miasuanvlcami mnrca'rnm arrm'rns.

ori in! Io. 130,016,

To all whom it may concern:

Be it known that I, HENRY BREWER, a citizen of the United States, dent of the city and county 'of Philadelphia,

State ofPennsylvanimand now residing at Wilmette,

and variations in temperature.

State of Illinois, have invented. certain new and. useful Improvements in -Measuring and Indicating Apparatus, of

which the following is a specification.

My invention relates to apparatus for indic'ating, measuring and recording conditions or variations in conditions as chemical, physical, electrical and 0th tions, and more particularly temperature My invention resides'in ap aratus, which may be in the nature of recor ing apparatus or with which a recorder may be coopera- 'tively associated, which controls a circuitor circuits for efi'ecting dition or variation thereof sadherindicatmg. means, such as lamp or other I the condition, .-as of temperature, .--ta1ns at a sponsive devices, slice-thermometers quite accurate measurement or indication of magnitude of the conand particularly of temperature. or variation thereoi pnd with such apparatus may .be associat signals, indicating the general magnitude of which obparticular time. More particularly in ap aratus of the character above referred to w rein a plurality of temperature reas thermo-couples, resistor the like, are subjected to temperatures which may widely and which ma exist in di erent localities, as'in diiferent urnaces or the like, said temperature responsive devices being brought successively or alternately into controlling relation with automatic mechanism whic -will produce the, indications or measurements above referred to, and'which may in addition produce a recordof the temper ture'variations. It is a further feature of my invention that eitherfa single calibrated 'measuring '01 indicating instrument, as a DArsonval galvanometer, may be employed for indicati or -measuring "tures' of sai temperature -responsive -devices, or such an indicating or measuring instrument :may be employed for each 0- said temperature res nsive devices.

My invention resi s in formerly a man be had to the er condimy invention resides .driving the the temperafurthe'r features-- scribed.

For an illustration of some of numerous forms my invention may take, reference may accompanying, drawing, in which:

Figure 1 is a perspective view cit structureembodying my 1nvention.- Fig. 2 is an elevational structure which, may r'atus such as shown in Fig. 1. Y

Fig. 3 is a section on the. line 3--3 of view of a modified ig. 4 is a diagrammatic view illustrating part of the structure shown in Fig. 1, together with a calibrated indicatin or meas uring instrument common .to a p urality of temperature responsive devices, with associated signals or indicators, and associated electricalcircuits.

Fig. 5 is a diagrammatic view illustrating parts of the apparatus shown in Fig. 1,'togather with a calibrated indicating or measuring instrument for each of the tcm rature responsive devices, with associate sig nals or indicators for each temperature responsive device.

Fig. 6 is a plan viewv eta fragment of the recorder paper showing a record produced thereon bythe two temperature responsive devlces in circuit for ifierent recorder.

In the illustrated example of my apparation are similar to those disclosed in Letters Patent of the United States to No. 1,125,699, Janna 4 not being limited to their employment. 7

Referring to the drawing, M is an electric motor, or any other suitable source of power, which rotatesthe shaft 1, preferably at substantially in turn drives the worm 2 meshin worm gear 3 secured shaft 4: Pivoted near its upper end is a lever 5- back of which and, pivoted upon lever 5 on a horizontal axis is the arm 6 'on with and each end of which is a. shoe 7 of cork or other suitable material frictionally cngaging the rim 8 of the clutch diskor w eel lengths of; time with the mechanism controlling the" parts thereof and their modeof opera-.

prior 19, 1915, my invenk t1on comprehending, ut

constant speed, which upon the dated December I, 1m, flerlal-l o. 278307, fled l'ebraary 81,1919. Application a for rehanezfled November 29,1922. Serial R0. M990.

be employed in appa- 9 secured upon the shaft 10. Secured upon ried thereby by the screw @8 threaded the shaft 4 is a cam 11: which periodicallythro'ugh, the hub 39 throughiwhich the shaft engages the lever orv member 5 and moves 10. asses. it outwardly away from the disk 9 in Opponv the shaft 1s similarl secured by 5 'tion to a sprin not shown, thereby screw 40 and hub 41 athlrd disk 42 carry- 70 ifting the dices 7 e from the-rim 8 of ing the arcuate indication controlling con'=- clutch disk 9, the afomsaidspring returntacts 43, 44 and 45 .all insulatedfromcach the shoes 7 into engagement with rim 8- other and prefera ly from the remainder r redeterminedrotationof cam 11. of the ap aratus- U n 51c shaft 4 is secured a second cam 12 Upon the shaft 10am similarly secured 75' 'w ich, after the cam 11 has lifted the s oe and adjustable as to angular'relation there- 7 from rim 8, actuates the end of finger 1 on the additional disks 35" and 42, carry- ,on the lower end of the arm 14 secured at ing respectively, the resistances 36', 37 of l its u r end to the member 15 pivoted at a second Wheatstone bri and the second 1 16, n the frame or member! 15 is 88- group of indication contro ling contacts 48, 3

cured e member 17, whose ugge'fedge 18 44- d 45; a

is inclined and increasesin heig t from the Whil th fiv s arat disks may be emcenter toward each side. Dis (1 imme; ployed asdescribe it will be understood diately above theedge 18 is v e needle or i th t th di k or any two or more of them 8 pointer 19 of any suitable measuring or mma nnderI-suitabie circummnces, be one as (limiting instrument, as example, a an the same unitary structure whereby the vanometer of which 20' is the movable coil diff e t t t; nd resistances may 'be or element which swings or deflects theneedle rotated in unison in predetermined angular or pointer 19 to the right or left. At opp relation with res t to each other b Shaft site s .o h m r 17 a t a 10. It is prefers le, however, that t e disk 90 ments 21 for limiting the-deflectionor swing 31 b ind d t, i hi h a e the two of needle. t y above the needle disks as and 42 may be a unitary structure;

and beneath which it normally freely swings hi h may mu my it bl angular p03 are the e ge 22, pr e y straight and sition u on the s haft 10; similarly the disks horizontal, upon members 23, 23 pivoted at 5- 1m 42 b a ita structure 5 a and en toward each other, whose angular position upon t e shaft 1Q ea i g 8 gap f cient Width between ma be anything suitable or desired. their inner endsto allow the free entry of 1 i 2 and 3 h a it combingthe needle when in balanced, zero or tion of disks as and 42 is indicated, it being 35 -m s the needlfl 19 normally swing understood that a similar unitary combinabetween 8*! 18 of member 'tion of disks 35' and 42 ma be employed if 17 and t 6 lower'edgefl 0f the members 2 desired. In Figs. 2 and 3 t e disk or wheel 23, which have the downwardly extending 5b is shown b way f a l a at one 5, 25 drawn toward each other y t e end of the shaft 10, though it will be under- 4o fi' Attached the ,lower 0f stood that it may be positioned at any lace 5 t e o level: 5 18 e tmngular P a longitudinally ofthe-shaft 10, rotated t as 27 carrying the P 28 p wlthby, and adjustable as to angular position ends of members t P thereon. In the example'illustrated the anposlte ends of the arm 6 are h ears or lugs gular position on the shaft 10 is adjustable 45 29 E P to be 8 y the "1 by clam ing thenut 35 against the hub 39 no 30, 30 511ml!!! shape an h y P on the isk thrusting the same frictiontioned secured P the shaft ally against the member 39" secured to the secured uP011 the shaft 10 is shaft 10. Upon the peripheryof the disk 35" Wheel 31 i insulating material y g is shown the resistance 36, 37 which may be v upon s periphery the r sistan e conductor a wire disposed as a helix upon a mandrel m j ch may be 1 9 1 in the form of. a 35' and insulated therefrom, the resistance h ll! l id lipon th disk 31 ngaging conductor 36, 37 itself terminating, as at a si nce i th stati n y Contact 2 and b, 2, while the mandrel 35 extendsj hereinafter referred to.. The disk 31 may beyond. and is'clamped to the periphery of so be secured to the sha t 10 in any uita l the disk 35" by the clamping piece 35', se- 12o alifilar relation with ct to' the other cured by screw 35', Secured to opposite faces 7 or members secu thereon, h set of the disk 35 are the members 35 and 35", screw 83 threaded through the hu 34- preferably of insulating material, on whose through which theshaft 10 extends. peripheral edges'the stationary contact 59.

00 Secured upon the, shaft 10 is' a second will ride-up in case the disk 35 is rotated, I25 wheel or disk 85 canrin on its periphery during the operation of the apparatus, the resistance 86, 87 -0 a Vheatstonebrid e through substantially 180 degrees from'the hereinafter mf fredto. The disk 35 is he d position indicated in Fig. 2. Upon a lateral in any suitableiangular position upon the face of the disk 35" may be dis the. a N shaft 10-with respect to the other disks caraforementioned contacts 43, an 48.

- through a commutator segment with the conversely, on guides, not shown, with respect to I the recorder paper P stored upon a roller or spool and having the marginal perforations 51, engaging teeth or pins upon the periphery of the roller 52, secured upon the shaft 53 which is driven by the motor M through the worm 54, gear 55, shaft 56, worm 57 and gear 58.' 7

Referring to Fig. 1, the resistance R is shown in a potentiometer circuit having the two branches 60 and 61, each including suitable resistances, the branches being connected inparallel with each other and in series with the battery or source of current-62 and ad- 'ustable resistance 63. S is a standardcell which maybe employed in well known man ner for procuring predetermined strength of current through the potentiometer branch 60 by adjustment of rheostat 63 when depressing the key 64, which brings the cell 8 and galvanometer G into series with each other and in shunt to the potentiometer resistance 65, the needle 19 of the galvanometer G being that indicated in Fig. 1. For normal operation, however, the standard cell is out of circuit and the switch 66 is in depressed or closed position whereby one terminal of the galvanometer G is connected to the conduc- .tor 67, which terminates in contacts 68 and 68,-bearing upon the commutator C, which may be secured upon and rotated by the shaft 56, Fig. 1." In the position indicated in Fig. 4 the contact 68 is in electrical .connection' tact'69, which connects to one terminal of the temperature responsive device or thermocou le T, whose remaining terminal connects to -t e conductor '70 connected to contact32 which bears upon the resistance R. A second temperature responsive device or thermocouple T has its one terminal connected to the conductor 70 and its otherterminalto the contact 71 bear1ng upon the commutator C, which has a contact which in 'a later angular position of the commutator Qbridges contacts 71 and68'. The function of these commutator contacts and the associated brushes or contacts is to bring the couples T and T successively or alternately into connection with conductors 67 and 70. The arcuate 00111- muta-tor contacts or segments associated with the; difierent thermo-couples are of difl'e'rent lengths, .whereby the thermo-couples are in connection with the conductors 67and for diflerent lengths of time. This is for the purpose of causing the marker 49 of the recorder' mechanism to make'longer marks as for'on'e thermo-couple and shorter v .for the other, these marks being 1 marks 49 made longitudinally of the paper P whic moves in the direction-of the arrow. Thecurve-orrecord drawn for orunder the'control of each thermo-couple is recognizable by I the difference in lengths of the components i or elements 49 and 49".

While only two temperature responsive devices T and T are shown, it will be, understood that my invention is not limited to employment of only two, also to the case where aflgreater number of temperature 'responsive,,'delvices is employed in association with suitable numbers of,

\Vheatstone bridges, meters and lamps.

The 'thermo-couples, while indicated in diagram as adjacent to eachother, will understood to be, located at any distance from each other, subjected to temperatures which may difi'er widely from each-"other','th'ev devices or couples being in fact if desired in entirely difl'erent and distinct Ifurnacesor other devices. I I When. thermo-couple T is in circuit with conductors 67 and 70, for the position of the commutator C indicated, the resistances 36, 37, upon disk 35 and the associated re-' sistances 74 and .7 5 are in communication with the indicating or measuring instrument V. The resistances 36, 37 are indicated as one and the same resistance conductor en'- gaged by the stationary contact. 59. Inas much as the'disk' 35 is rotated to various positions,

while the remainder or. part on the other sideof contact 59; is designated 36. These two resistances 36, 37', with stationary re sistances 74 and 75', constitute the four. re-

sistances or arms of a Wheatstone bridge arra ment of which two arms, 36, 37, are

ances and 74 and'with'one terminal of the, calibrated indicating-pr measuring instrum'ent V, as a'DArso'nval galvanometer, of which only the movable coil 82 is indibut' is applicable that part of the resistance '36, 37" I to'the' right of contact 59 is designated 37,

cated, indication ot'the usual, permanent a magnetsbein omitted. The m'ovable coil 82 actuates t e needle or coo es-with the two sca es s and e,either or "thjof which may be present, as ,may

in r, 83. which be desired., The scales is calibrated. in. any

suitable Iunits', as those "of voltage, current or-I-temperature. In the example illustrated, I

it is calibra'ted; in temperature units to measure orindicate the actual temperature of thethermo-couples." 1 The scale a may be T .rotatably aqju ted wm suitable position about the pivotalaxis? of the-coil 82. "The scale a may be termed a deviation scale,-

showing how much the temperaturesof the thermo-couples deviate from a given: normal or desired temperature corres onding'with the zero or mid-marking o the scale s,

l the deflections-to either side thereof indicatmg in any suitable units, as of tem the amount'of deviation, without, owever, measuring or indicating the actual tem ratures of'the thermo-couples. The ad ustthe instrument V is for calibration or compensating purposes, as for compensating for resistance of the leads 72, 79 and 82", or other variables which ma have to be taken into account. From tile resistance 78 extends the rature,

' lead 79 to the commutator brushes or con' tacts 80 and 80, with which cooperate, re-

nects the conductor or lead 82" couple T is in circuit spectively, the commutator brushes or contacts 81 and 81. With the brush 81 conconnectin with the 'unction between the resistanms 3 and 0% the Wheatstone bridge Brushes or contacts and81 are brid ed by a commutator contact, when couple is in circuit, as indicated, thus bringin the meter V into 0 rative relation with t e aforementioned eatstone bridge.

Similarly, the commutator brushes or contacts80 and 81 bring the meter V, when with conductors 67 .and 70, into connection with similar points on the second Wheatstone bridge comprising the resistances 36, 37, 74 and 75, resistances 36 and 37 being rotatable with disk 35 with respect to the contact 59 connected to conductor 77. To a point between the resistances 7 and 75, is made aconnection to the conductor 76. With the commutator brush or contact 81 connects the conductor 82 for bringing the meter V into circuit, said conductor connectin with the junction between the resistances 3 and 75.

Electrical incandescent lamps g, b, w and r, respectively colored, if desired, green, blue, white and red, have one-terminal connected to the conductor 83 which with the conductor 84 connects to any suitable source of current supply, which may be the same source to whic conductors 76 and 77 connect. The conductor 84 connects to the commutator brushes or contacts and 85, with which brushes or contacts 86 and 86. In the osition of the commutator C indicated in ig. 4, with the thermo-couple T in circuit, the contacts85 and 86 are bridged by the commutator segment or contact whereb the conductor 84 is brought into electrica communication with the conductor 87 connecting with the two stationary brushes or contacts 89 and cooperating with contacts 44 and 45 associated with the rotatable Wheatstone bridge arms 36, 37; The commutator brushes or at a difierent t me,

contacts 85 and 86 are as when couple T is in cooperate, respectively, the

lamp g as well as with the stationary brushes or contacts 89 and 90', cooperating with the contacts 43, 44 and 45 rotatable by the shaft 10 and cooperating with the second Wheatstone'bridge having the rotatable arms 36 and 37. In the position of the parts of the commutator C indicated in Fig. 4 the circuit of the from the fact that it doeswhen two thermo-couples a certain one of them is this case T that is, couple T is in circuit. At a later stagewhen the couple'l is in circuit,-t he lamp will glow, due to bridgin 86,,and will so indicate t circuit. v

The contacts 43, 44 and 45 are connected,

are employed, that not in circu-1t,,.in

at that couple is in In Fig. 5 the arrangement in many.

terminal of the.

lamp 9 is open, and. not glow indicates,

of contacts 85 and v it indicates that thermorespects the same as. that of Fig. 4; however,

a separate indicating or measurin ment is in this case associated with each thermo couple or temperature-res nsive device; and with each thermo-coup e or temperature responsive device is associated a segrr'ate set of indicating lam s or signals.

' arts similar to those in ig. 4 are indicated with like reference characters.

Here again the thermo-couples, or equivalents, T, T are controlled by th tator C, which may be driven by shaft 56, Fig. 1, to be brought into circuit successively or alternately with the conductors. 67 and 70. When the thermo-oouple T is in circuit, in the osition of the commutator C indiseated, t heindicating or measuring instrument V is in circuit, through commutator contacts or brushes 80, 81 and the associated conductors 79, 72 and 82" with the u per or first Wheatstone bridge comprising t e movable resistances 36, 37. and stationary resistances 74, 75. When the thermo-couple T is in circuit in the ition of the commutator C indicated, tli group of indicating lamps r, w and b isbrought into operative relation through the commutator brushes or contacts 85 and 86 and conductor 87 with e the stationary brushes or contacts 89, 90, co

0 ting, as described in' connection with 1g. 4, with the contacts 43 44 and 45, which move in unison with the Wheatstone bridge resistanms 36 and 37. Similarl a second grou of lamps r, w and b is ater, when coup e '1 is in circuit, brought into cooperative relation through commutator contacts or brushes 85 and 86 and conductor 88 with the contacts or brushes 89, 90 cooperating with the contacts 48, 44 and 45 moving in instrushoes 7, 7 from the rim 8 temperature,

' circuit through the unison with the resistances 36, 37" of the second \Vheatstone bridge whose other resistances are 7 4 and 75. WVhen the couple T is in circuit the junctions between resistances 36, 74* and 37, 75 are connected by conductors 72 and 82 with the second measuring or indicating instrument V through the calibrating resistance 7 8 with the commutator brushes or contacts 80 and 81 The mode of operation is as follows: Vith the thermo-couple T in circuit, it produces an -electro-motive-force which is impressed u on the galvanometer G in opposition to t e potential impressed upon the alvanometer by the potentiometer current. when these potentials are equal the galvanometer G does not deflect and the needle 19 is in the mid-position indicated in Fig. 1. H now the temperature of the thermo-couple T increases, its electro-motive-force will increase and cause deflection of the galvanometer needle 19. toward the right, for example, whereby, due to the periodic. vertical movement of the member 15 by cam 12, the needle 19 is clamped between the inclined edge 18 and the lower edge 22 of the right hand member 23, causingthe arm 25 to be tilted in a clockwise direction about its pivot 24, thereby pushing on the right hand pin 28 on plate 27, and so tilting the movable or driving clutch member or arm 6 in a clockwise direction, while cam 11. is holding I of clutch wheel or disk 9, the angular movement of the memher 6 being dependent upon the degree of deflection of needle engage the disk 8 upon release of the arm 5 of ram 11, and the left hand cam'30 thereafter engages the left hand lug 29, rotating the driving clutch member 6 in counterclockwise direction, carrying the disk 9 in countercloc-kwise direction through an equal angle. This rotates the resistance R-with respect to the contact32 in such direction as to tend to restore a balance of the electro-motive-' forces which tends to decrease the deflection of the needle 19 which eventually. due to successive operations and attaining a balance, may again find-itself in mid or zero position indicated in Fig. 1, and no further actuation of the shaft 10 will occur. The apparatus is in balance for the then temperature of the thermo-couple T, and in attaining such balance the marker 49 has been moved transversely to the paper P, making one of the longer-marks 49. Fig. 6.

If when thisbalance is again attained the temperature to which, the thermo-couple T is subjected is above the normal or desired the contact 43 will be in engagement with contact- 89 and so close the 19. The shoes 7 again.

' normal or desired temperature.

red lamp xr, which ac; cordin ly gives a, signal or indication to they efleet. t-the temperat-ure is. too high; If --the=teliiperatmie-issnot fifiztxive the mormal or desired tempe glow, indicating that the temperature is too high, but only slightly so. Similarly, if the temperature to which the thermo-couple T is subjected and at which the needle 19 comes to a balance is below the desired or normal temperature, contact 45 will bein engagement with brush 90 and so cause energization of blue lamp b indicating too low a temperature, and if this temperature is not far too low, contacts 45 and 44 will be simultaneously in engagement with contacts 90 and 89, respectively, so that both lamps wand 12 glow. a

While the couple T is in circuit as above assumed, during partial rotation of the commutator C and while the apparatus automatically rebalances itself or moves in direction to rebalance itself, the Wlieatstone bridge arms 36, 37 v are rotated to like ex tent and in like direction as the potentiometer resistance R. Assuming the temperature'of the couple T to be above normal or desired temperature, and the resistances 36, 37 to have been rotated to a position counterclockwise to that indicated in Fig. 4, resistance 36 will be shorter than resistance 37, the VVheatstone bridge will be unbalanced, and there will be a correspondin difference of potential of predetermined direction impressed upon the conductors 79, 80, causing the calibrated meter V to deflect toward the right, for example. The needle 83 in so de-' fleeting to the right will, as regards scale s, indicate in degrees of temperature, or other suitable units, the extent of departure of temperature of-the couple T from the desired or normal temperature, the desired or normal temperature being indicated at 0 on scale 8 Supposing the desired or normal temperature for the couple T is 1200 degrees; the scale s is rotated to such position that when there is no current through the galvanometer coil 82 the needle 83 points at 1200 degrees, as indicated in Fig.4. In other words, degree marking of the scale s is brought opposite the zero marking O of the scale 8; t the same time scale s is set for 1200 at 0,- the disc 35 carrying resistances 36, 37 is also set so that the \Vlieatstone bridge is balanced when the..-recorder reads 1200". \Vhen, as assumed, the needle 83 deflects toward the right, it simultaneously indicates as to scale s the actual temperature of the thermot'ent of departure or deviation from the It may the 1200 iis couple T and as to the scale a merely the-exsometimes not be desirable or necessary to v have. hotlrscales 8- and a but my. invention comprehends employment both. j

if. the temperature of, the

inthe instrument,

"coupleT, is also true, of thermo-couple T 7 the two couples being alternately or successively brought into operative relation with the potentiometer circuit, including resistance R and galvanometer G, by the commutator C which i desired speed. When couple T is so brought nently associated into circuit, connection between conductor 84 and conductor 87' is broken and established with conductor 88, bringing into operative relation the lamps r, w and b, the contacts 89 90", cooperating with contacts 43*, 44' and 45, moving in unison with the second Wheatstone bridge comprising resistance arms 36, 37. Here again the action of the indicating lamps is the same as described in connection with thermo-couple T. Similarly when couple 'I is brought into circuit connection between the'meter V and the first Wheatstone brid comprising resistances 36,37, 74 and 75 is broken and established with the second Wheatstone bridge through conductor 82. The meter V then operates as before to indicate by scale a the actual temperature of the couple T and by scale 8 its deviation from the desired or normal tem' perature.

When couple T is in circuit, the green lamp g, will low, indicatin that fact; and when con Is it is in circuit lamp 9 does not glow, an so indicating that fact.

ith the apparatus arranged-as indicated in Fig. 5 the operation will be understood to be similar to that described in Fig. 4 with the following exceptions: 4

ere are separate indicating or measuring instruments V and V for the two Wheatstone bridge structures, and these meters are brought into circuit by-the commutator C-altematel or successively in unison with the couples ,,T the meters indicating both actual temperature and deviation from normal of their respective thermo-couples.

Furthermore, two groups of red, white and blue lamps are emplo ed, each permawith avt heatstone bridge structure, the groups being \brought into 0 erative relation alternately'or successive y in unison with the thermo-couples T and T As in the case of Fig. 4, glowing of the white light indicates that the temperature is at the desired ornormaltemperature; glowing of the red light indicates too high a temperature, and the blue light too low a tempera: ture; and.the white light may glow simultaneously with either the re or the blue light, indicating that the temperature is slightly too high or slightly too low.

of the meters onl . riiterruptlon of the circuits rotates at any suitable or.

successively into tion with said instrument ower under control of said V and V y thecommutator C may be omitted, and these meters permanently connected to the respective Wheatstone bridges. But in such'case when thermo-couple T is not in circuit its meter V may give, indications, due to the fact that its associated Wheatstone bridge has been actuated from normal or zero position b the mechanism shown in Fig. 1, due to de ection of the galvanometer needle 19 under control of the thermo-cou le T. 'But such indication by the meter I 1 garded if it be remembered or known that its couple T is not in circuit. And this may be indlcated by the fact that none of the lamps r, 'w and b is glowing What I claim is:

1. The combination with adeflecting member, of a source of ower, variable electrical means and a plura ity of electrical devices adapted severally to co-operate with said may be at such time disremeans to control said deflecting member,

said means varied by said source of power under control of said deflecting member, means for bringing said electrical devices co-o eration with said means, an instrument giving indications .respecting said electrical devices, and controllers for said instrument brought successively into co-o eration with said instrument and actuated y said source of ower under con-. trol of said deflecting mem r.

2. The combination with a deflecting member, of a source of ower, variable electrical means and a plura ity of electrical devices adapted severally to co-operate with said means to control said deflecting member, said means varied by said source of power under control of said deflecting member, means actuated by said source of power for bringing said electrical devices successively into co-operation with said means, an instrument' giving indications respecting said electrical devices, and control e strument brought successively into co-operaand actuated by said source'of deflecting mem r.

3. The combination with a deflecting member, of a source of ower, variable electrical means and a plura ity of electrical devices adapted severally toco-operate with said means to control said deflecting member, said means varied said source of power b 1 under control of said deflecting member, an

instrument said first named means and their respective controllers into strument.

4. The combination with :1 her, of a source of power,

o-operation with said indeflecting memvariable electrical rs for said inmeans and a plurality of. electrical devices adapted severally to co-operate with said means to control said deflecting member,

said electrics devices, a controller or sai instrument for each of said electrical devices, and means actuated bysaid source of power for bringing said electrical devices'in I succession into co-o ration with said first named means and air respective controllers into co-o' rationwith said instrument.

5. The com ination with a lvanometer having a deflecting member, '0 a source of power, variable electrical means and a plurality of templerature responsive devices adapted severa y to co-operate with said 'means in controlling said deflecting member,

said means variable by said source of power under control of said deflecting member, an instrument giving indications respecting the tem ratures of said temperature responsive .devices, a controller for said instrument for each of said temperature responsive devices, and means for ringing and temperature responsive devices in succession into co-o eration with said first named means and t eir controllers in succession into co-operation with said instrument.

6. The combination with a alvanometer a having a deflecting member, 0 a source of vmeans in contro ing power, variable electrical means and a plurality of temperature responsive devices adapted, severall to co-operate with said said deflecting member, said means varlableby said source of ower under control of said deflecting memr, and instrument giving indications respecting the temperatures of said temperature responsive devices, a controller for said instrument for each of said temperature responsive devices, and means actuated by said source of power for bringing said temperature responsive devices in succession into cooperation withvsaid first named means and their controllers in succession'into co-operation with said instrument.

7. The combination with a alvanometer having a deflecting member, 0 a source of power, variable electrical means and a plurality of temperature responsive devices adapted severally to co-operate with said means in controlling said deflecting member, said means variable by said source of ower under control of said deflecting mem er, a

7 second galvanometer giving indications respecting the tem ratures of said temperature responsive evices,aWheatstone bridge for each of said temperature responsive devices adapted to control said galvanometer and varied by said source of power under control of said deflecting member, means for bringing said temperature responsive devices successively into co-operation with brin ing said first named -means-, and means for said Wheatstone. bridges successive y into co-operation with saidsecond ga-lvanometer. 9 a

8. The combination with 'a'; galvanometer having a deflecting member,fof a source of power, variable electricalmeans and a plurality of temperature responsive devices adapted se'verall to co-operate with said means in contro ling said-deflecting member, said means variable by, said source of wer under control of said deflecting memer, a second galvanometer giving indica-.

9. The combination with a galvanometer having a deflecting member,-of a source of power, variable electrical means and a plurality of temperature responsive. devices adapted severally-to cooperate with said means in controlling said deflecting member, said means variable b said source of power under control of sai deflecting memher, a second galvanometer given indications respecting the temperatures of said temperature responsive devices, a Wheatstone bridge for each of said temperature responsive devices adapted 'to control said galvanometer and varied by said source of power under control of said deflecting member, and means actuated by said source of power for bringing said temperature responsive devices successively into co-operation with said first named means and the respective Wheatstone bridges into co-operation with said second galvanometcr.

10. The combination with. a deflecting member, of a source of power, variable electrical means and a plurality of electrical devices adapted severally to co'operate with 1 said means to control said deflecting m.em her, said means varied by said source of? power under control of said deflecting member, means for bringing said electrical devices successively into co-operation with said means, an instrument giving indications repower under control of said deflecting memhaving a deflecting er, means for bringing said electrical devices successively into co-operation with' said means, an instrument 'v ng indications respecting said electrical evices, controllers for said instrument brought successively into co-operation with said instrument and actuated b said source of power under control of said deflecting member, and means for indicating which of said devices is in co-operation with said first named means.

12. The combination with a galvanometer having a deflecting member, of a source of power, a potentiometer, a plurality of thermo-couples adapted severally to co-op-.

erate with said potentiometer in control of said galvanometer, means for bringing said thermo-couples successively into co-operation with said potentionmeter, a resistanceof said potentiometer actuated b said source of power under control of said deflecting member, a second galvanometer giving indications respecting the temperatures of said thermo-couples, a -Whfeatstone bridge for each of said thermo-couples for controlling said second' galvanometer and controlled'by said source of power under control of said deflecting member to vary the electro-motive-force im ressed upon said second galvanometer, and means actuated by said source of power for bringing said Wheatstone brirl eration with sai second galvanometer.

13. The combination with a alvanometer member, 0 a source of power, a potentiometer, a lurality of thermo-oouples adapted severa 13. w co-operate with said potentiometer inicontrol of said galvanometer, means forbrin'g-ing said theme-couples successively into, co-opera Y of said second tion with said tentiometer, a resistance potentiometer actuated by said source of powerunder control ofsaid deflecti member, a second galvanometergiving in ications respectin the temperatures of said thermo-couples, a%Vheatstone bridge for each of said theme-coupl f controlling said second galvanometer and controlled by said source-"of power undercontrol of said deflecti member to vary electro-motive-force lvanometer, and ing eaic i Wheatstone bridges into co-operation with sai nometer. f 14." The combination with a lvanometer having a. deflecting member, 0 a source of power, variable electrical means and a succemive y second galvalurality of temperature responsive successively into co-opimpresed u n;

means or bri' second galvanometer giving indications respecting the temperatures of said temperature responsive devices, a controller for each of said temperature responsive devices 'for' controlling said second galvanometer, means for bringing said temperature responsive dev ces into co-ope-rative relation with said time, source of power under control of said defleeting member and producing a disjointed mark for each of said temperature responsive devices, each of said marks comprising componets of diflerent lengths, andmeans for bringin said controllers in succession into operative relation with said second galvanometer.

15.. The combination with agalvanometer having a deflecting member, of a source of power, variable electrical meansand a plurality of electrical devices adapted severally to co-operate with said means to control said galvanometer, said means variable by said source of power underfcontrol of said defleeting member, a'recorder marker actuated by said source of wer under control of said deflecting mem different lengths of time, whereby said of component marks of different lengths.

'16. The combination with a deflecting member, of a source of power, variable 'elec-' trical means and a plurality of electrical devices adapted her, said means varied b5 power under control of sai deflecting memr, means for bringing' aid electrical deand means for bring.- ing said electrical devices sucoessively into co-operation with said first named means for;

wer.

first named means for difierent periods of v a recorder marker actuated by said ico ' everally to co-operate with said means to control said deflecting mem said source of vices succeseiv'ely'into co-operation with said means, aninstrument for each of said else-' tricaldevices 'for making indications Wlthv.

res t thereto, and. a controller for each of sai instruments actuatedby said source of; pgwer under conrol of said deflectiug mem g 17, The combination with member, of a source ofpower,"variable I andaplurality of electrical de-V severally to co-operate witb 1 id control said, deflecting mem- Y r, said 1 varied b wer under control of said deflecting nto co-operation with an instrument for each of said for making Y indications r, means forfliringing. said electrical de-" '-vicea successively saidim [electrical evices 'with' respect thereto, a controller for each 01 said instruments actuated by said source said source of I I of power under control of said deflecting member, and means for bringing said controllers successively into co-operationwith their respective instruments.

18..The combination with a deflecting member, of a source of power, variable electrical means and a plurality of electrical devices adapted severally to co-operate with said means to control said deflecting member, said means varied by said source" of electrical depgwer under control of said deflecting memmeans for bringing said vices successively into co-operation with said means, an instrument for each of said electrical devices for making indications with respect thereto, a controller for each of said instruments actuated by said source of Egwer under control of said deflecting memr, and means for bringing said controllers successively into co-operation with their respective instruments in unison with said sec ond named means.

4 having a deflecting member,

' spective instruments.

.19. The combination with a galvanometer having a deflecting member, of a source of power, variable electrical means and a plurality of temperature responsive devices adapted severally to co-operate with said means to control said galvanometer, said means variable by said source of power in controlwith said deflecting member, an instrument for each of said temperature responsive devices for making indication of temperature of the same, a controller for each of said instruments actuated by said source of power under control of said deflecting member, and a commutator for bringing said tiemperature responsive devices succe'sive y into co-operation with said means and for bringing said controllers successively into-co-operation with their re- 20. The combination with-a galvanometer' of a source'ot power, electrical means and a plurality of tem erature responsive devices adapted several y toco-operate therewith in control'of for bringing said responsive devices successively into co operation with said means, a group said galvanometer,

of. indicators for each of said temperature responsive devices, and contact structure controlling each of said groups and actuated by saidisource of power under control of said deflecting member.

21. The combination with a alvanometer having a deflecting member, 0 a source of power, electrical means and a plurality of temperature responsive devices adapted severally to co-operate means for bringing said temperature responsive devices successively into co-operation with said means, a group of indicators for each of said temperature contact structure conresfignsive devices,

a ps a m ss by.

tro ng each ofefid pressed upon the associated therewith in control of said source of deflecting mem er, and means for bringing said contact structures into operative relation with said groups of indicators in succession:

22. The combination with a alvanometer having a deflecting v member,- power, a potentiometer and a plurality of thermo-couples adapted severally to 00-0 ate with said potentiometer in contro 0 said galvanometer, a meter for each. of-said thermo-couples, a Wheatstone' bridge for each o f sa1d meters, each of said bridges COIDPIlSlDg resistance moved by said source of power under control of said deflecting member to vary the electro-motive-force im-' pressed upon the associated meter, -and means for bringing said thermo-couples successively into co-operation with said potentiometer and said meters successively into cooperation with their Wheatstone bridges.

23. The combination with a galvonometer having a deflecting member, of a source of power, a potentiometer and a plurality of thermo-couples adapted severally to co-operof power under control of said deflectingmember to vary the electro-motive-force immeter, means for ringing said thermo-couples successively into co-operation with' said potentiometer and said meters successively into co-opera-, tion with their Wheatstone bridges, a group of indicators foreach thermo-couple, contact structure for each of said oups actuated in unison with one of said heatstone' bridges, andmeans for bringing said groups of indicators successively into'co-operation with their respective contact structures.

24. The combination with a deflecting. member, of a source of power, variable elec trical means and a plurality of electrical devices adapted severally to co-operate with said means to control said deflecting member, said means varied by said source of power under control of said defiect' member, means actuated by said source b i power for bringing said electrical devices successive ly into co-operation with said means, an instrument giving indications respecting said ment brought successively into co-operation with said instrument and actuated by said source of power under control of said deflecting member, and a a marker actuated. by said source: of power under control .of said deflecting-member producinga'reeord related to the indications of said instrument.

a-. deflectingvariab y le else 25. The combination with member, of a source of power, trmal means 0 asourceof.

' devices,

deflecting mem adapted severally to co-operate with said means to control said deflecting memher, said means varied by said source of power under control of said deflecting member, an. instrument giving indications respecting said electrical devices, a controller for said instrument for each of said electrical devices, means actuated by said source of power for bringing said electrical devices in succession into co-operation with said first named means and their respective controllers into co-operation with said instrument, and" I a marker actuated by said source of power under control of said deflecting member producing a record related to the indications of said instrument.

26. The combination with a galvanometer having a deflecting member,-of a source of power,,variable electrical means and a plurality of temperature responsive devices adapted severally to co-operate with said means in controlling said deflecting member, said means variable by said source of power under control of said deflecting member, an

instrument giving indications respecting the temperatures of said temperature responsive a controllerfor said instrument for each of said temperature responsive devices, means for bringing said temperature responsive devices in succession into co-operation with said first named means and their controlleis in succession into co-operation with said instrument, and a marker actuated by said source of ower under control of said deflecting mem r to produce a record related to the indications of said instrument.

27. The combination with a having a deflecting member, 0 a source of power, variable electrical means and a plurality of tempierature responsive devices adapted severa y to co-operate with said means in controlling said deflecting member, said means variable b said source of war under control of sai deflectin memr, a second galvanometer giving indications respecting. the tem ratures ;of said temperature responsive evices, a Wheat- .stonebridge for each of said temperature responsive devices adapted to control said lvanometer and varied by said source of g'gwer under control of said-deflecting memr, means for bringing said temperature responsive devices successively into co-operation with said first'namedmeans, means for bringin said Wheatstone bridges successively into co-operation with said second galvanometer, and a marker actuated by said source of ower under control of said r to produce a record re-' lated to the indications of said second galvanometer. Y

28. The combination with a alvanometer having a deflecting member, 0 power, a otentiometer, a lurality of thermo-coup es adapted severa ly to COTOP- thermo-couples alvanometer of said meters.

a source or erate with said said galvanom eter, means for bringing said successively into co-operation with said potentiometer, a resistance of said potentiometer actuated by said source of power under control of said deflecting member, a second galvanometer giving indications. respecting the temperatures of said thermo-couples, a Wheatstone bridge for each of said thermo-couples for controlling said second galvanometer and controlled by said source-of ower under control of said deflecting mem r to varythe electro-motive-force impressed upon said second galvanometer, means for bringing said Wheat- .stone bridges successively into co-operation with said second galvanometer, and a marker actuated by said source of ower under control of said deflecting member for producin a record related to the indications of sai second galvanometer.

29. The combination with a alvanometer having a deflecting member-,0? a source of power,a potentiometer anda plurality of thermo-couples adapted severally to co-oFerate with said potentiometer in contro of of power under control of said deflecting member to vary the electro-motive-force impotentiometer in control of pressed upon the associatedmeter, means for bringing said therme-couples successively into co-operation with said potentiometer and said meters successively into co-operation with their Wheatstone bridges, and a marker actuated b said source of power under control of said deflectin member for producing a record related to t e indications 30. The combination with a plurality of temperature responsive devices, of an instrument for each of said devices indicat' the temperature thereof, means for successively bringing said temperature. responsive devices and said instruments into operation, a group of signals for each of said temperature responsive devices, and means 0 rating with said first named means for ringing said groups of signals into operative relation with said temperature responsive devices.

31. The combination with a plurality of devices responsive to changesin a condition, of a structure movable under control of said devices, an indicator for each of said devices, means 0 rated by saidmovable structure contro ing said indicators, and means for bringing said devices successively into co-operation with said structure and said indicators successively into co-operation with said first named means.

32. The combination with a plurality of devices for producing electrical effects cor- 1 galvanometer responding with variations in magnitudes of conditions, of a galvanometer, a grou 0f signals for h of said devices, a switc ing mechanism for each of said groups of signals for controlling the si als t dividually,

ereof mswitching mec anism 'for associating said devices one at' a time with said galvanometer, and means controlled by said for actuating said first named switching mechanisms simultaneously.

33. The combination with a plurality of devices for producing electrical efiects correspondingwith variations in magnitudes of conditions, of 'a galvanometer, a grou of signals for each of said devices, a swim 'ng mechanism for each of said groups of s' devices "for respond with'thepxtents andswitching 'of said nals of each of said groups nals for controllinglthe viduall switching signals thereof in 1- vanometer, vanometer means controlled by said galfor actuating said first named other, andswitching' mechanism for rendering said groups of signals operative in succession.

34. The combination with a plurality of temperature responsive devices, of a galvanometer, a group ofsignals'for each of said devices, a switching mechanism for each of said groups of Bi als for controlling the signa thereof in ividuall y, switching'mechanism for associating said devices one at a time with said galvanometer, and

actuating said first named mec nisms simultaneously.

85. The combination with a plurality ofdevices for producing electrical efiects correspond mg with variations in magnitudes of conditions, of a galvanometer a group of signals for each of 7 said devices, swl crating periodically to bring said devices one at a time into 0 rative relation with said galvanometer an to render said groups e of signals 0 rative in succession, a movab structure w ose movements are controll bysaid galvanometcr, and a switch for each groups of signals actuated movable structure and controlli indivi ually. 36. The'combination with producing electrical efiects corresponding with variations in magnitudes of conditions, of a-galvanomete'r, a group of signals for each of said "devices, switchesoperating riodically to said devices one at a time into said galvauometeran to render said grou of signals operative in succession, a m vab .e

structure, means controlled, by said vanometer for eflecting movements '0' said structure whose extents and directions cordireetiom of movement of said vancmeter, and

mechanism for associat-' sai devices one at a time with said galhanisms in unison'with each tivein successl means controlled by said galvanometer for temperature by said the siga plurality of.

operative relation with controll of said groups individ iifll switch'for each of said of signals actuated by said movable structure for controlling-the signals of each groupiindividually. r

37; The combination with a plurality'of devices for producing electrical effects cor responding with variations in magnitudes of alvanometer, a grou of conditions, of a signals for each 0 said devices, aswitc ing mechanism for each of nals for controlling the signals thereof in ividually, switching mechanism for associating said devices one at a time with said. alvanometer means controlled by said ga vanometer for actuating said switching mechanisms simultaneously an galvanometric means controlled by said galvanometer for giving indications respecting said magnitudes of said conditions.

38. Thecombination with a plurality of devices for producing electrical efiects corresponding with variations in magnitudesof conditions, .of a galvanometer, a grou of; signals for each 0 saiddevice's, a switching mechanism for each of said lgroups of signals for controlling the signa s thereof in 1- viduall ,switchingmechanisln ing'sai devices one at a vanemeter means controlled by said nometer for actuating said first named switching mechanisms, switchin for rendering said groups of signals'opera forv associatgalvanometer 'for said conditions. I

3i). The combination'with a plurality oi responsive devices," of a' henometer, a groupof signals for each 0 said devices, a switc ing-mechanism for each of saidgroups of signals for controlling the signals thereof individually, switching mechanism for associatin said devices one at a time with said .ga vanometer, means controlled by said galvanometer for actuating said first named switching mechanisms simultaneously and 'galvanometric means controlled by said galvanometer for giving indications respecting the temperatures 0 said devices. I

40. The combination with a plurality of devices-for produci respondin with variations of conditions, of a galvanometer, a' of-signals for each of said devi switches operating-periodically to bring and one at a time-into said galvanometer an of .lignllfl 0 structure w said galvanom'eter, groups of si structure an in magnitudes to render said groups rative in succession, a movab e 'ose movements are controlled b ctuated bysai the said groups of a1 electrical efiects cordevices operative relation with f a switch for-each of sai movable d of ch galvanom first named timewith said a and galvanometric means a controlled by said dications respecting said magnitu ea o Ill structure,

individually,

' 1 playing plurality of simultaneously, switching mechanism'for of's'ald devices,

.' tric means controlled by said movable structure for giving indications magnitudes of said conditions.

41. The combination with a plurality of I devices for producing electrical efiects corresponding with variations in magnitudes.

of conditions, of a galvanometer, a oup of signals for each of said devices, switches operating periodically to bring said devices I. one at a time into said 'galvanometer an rative relation with (i to render said grou s of signals operative in means controlled by said galvanometer for efl'ecting movements of said ll structure whose extents anddirections corspondwith the extents and directions of movement of said galvanometer, a switch for each of said groups of signals actuated by said movable structure for controlling the Q signals of each group individually, and galvanometric means controlled by said movable structure for giving indications respect ing. the magnitudes of said conditions.

- 42. The combination with a plurality of devices for producing electrical effects cor- {responding with variations in magnitudes of a galvanometer, a group.

of conditions, of signals for each of said devices, a switching mechanism for each of said groups of signals for controlling'the signals thereof switching mechanism for associating said devices one at a time with said galvanometer, means controlled by said galvanometer for actuating said first named switching mechanisms simultaneously, and

a galvanometer for each of said devices con.-

trolled by said first named galvanometer.

. 43. The combination with a plurality of devices for producing electrical effects cor: responding with variations in magnitudes of conditions, of a galv'anometer, a group said devices, a switch-- of signals for each 0 ing mechanism for each of said' ups of si als for controlling the signa thereof in d i viduallyand comprising means for disthe signals of a group associating saiddevices one at atime with said galvanometer, and means controlled by said galvanometer for actuating said first named switching mechanisms simultaneously. I

44. The combination with a plurality of devices for producing electrical efiects corresponding with var ations in magnitudes of conditions, of '-a galvanometer, switchmechanism fOr associating said devices with saidv galvanometer, a movablestructure; whose .movements are controlled by said 'vanometer, a galvanometer for eac last. named respecting the ing mechanism succession, a movab e time, for 'efiecti a .circuit for each of said alvanometers, and means actuated bysai movable structure controlling said circuits. v 45 ,The combination with a plurality of devices -for producing electrical effects correspondin with. variations in, magnitudes of condit ons, of. a galvanometer, switchfor associating said devices with said galvanometeiya movable struc ture whose movements are controlled b' said galvanometer, a galvanometer for eac of said devices, a circuit for each of said last named galvanometers, means actuated by said movable structure controlling said circuits, a plurality of signals, and switch ing mechanism for, controlling said signals actuated by said movable structure.

46. The coimbination with a defiectin member, of variable electrical means an a plurality of electrical devices adapted severally to coo erate with said means ,to control said de ecting member, means for bringing said electrical devices successively into cooperation with said means for difierent lengths of time and a single marker actuated under control of said deflecting member for periods corresponding to. saidglengths of t me for eifectin ponent marks of di erent lengths.

. 47. The combination with a plurality of temperature responsive devices, of a movable membe'r controlled by each of said devices for different lengths of,time, and a l single marker actuated by said mova'ble member for periods corresponding tosaid lengths of time, for efi'ectin records having component marks of di erent lengths.

48. The combination with a'plurality of devices responsive to char s m a condition, of a structu'removab e under control of each of said devices for diflerent lengths of time, and a recordermechanism .actuatedsby said structure "for riods corresponding to said lengths of time, for efiecting records having component markis' of diiferent lengths; v

' 49. The combination with a plurality'of devices' responsive to chan m a condition, of a; structure movab 0 under control of each of said devices for difl'erent lengths of time, and mom for, making a plural record with a single marker comprising apparatus actuated by said structure for periods correspondlng tosaid lengths of records having component marks of di erentlengths. I

"In testimony whereof I have hereunto aflixed my signature this 25th day of November, 1922.

HENRY BREWER.

records having com- 

